JPH0720815B2 - Elevator signal transmission device - Google Patents

Description

Description: [Industrial field of use] The present invention relates to an improvement of an elevator signal transmission device configured by using a microcomputer.

[Prior Art] In an elevator hall, a hall button for registering a hall call, a call registration light for displaying that the hall call has been registered,
An indicator etc. showing the current position of the car is installed. Further, a destination floor registration button, a destination floor registration light for indicating that the destination is registered, an indicator door opening / closing button, etc. are installed on the car side. The signal processing is performed by an electromagnetic relay, and one signal line and one relay are required for each signal.

In this case, the relay is incorporated in the control device installed in the elevator machine room provided on the roof of the building, and the hall buttons are for up and down, so that n
Only 2n-2 signal lines for the landing buttons in the building on the first floor are required (there are no landing buttons for down and up on the bottom and top floors, respectively).

Similarly, on the car side, one line is required for each signal. For this reason, in a high-rise building, the number of signal lines increases, which makes wiring processing difficult.

As a solution to this problem on the hall side, for example, there is an elevator signal transmission device disclosed in JP-A-58-69685. However, in recent years, one-chip microcontrollers (hereinafter referred to as microcomputers)
With the widespread use and cost reduction, it has become possible to further reduce the number of signal lines by replacing the storage device with a microcomputer.

Next, the signal transmission device of the elevator will be described with reference to FIGS. 6 to 8.

FIG. 6 is a block diagram showing a conventional elevator signal transmission device, FIG. 7 is a detailed block diagram of a portion indicated by A in FIG. 6, and FIG. 8 is an elevator signal transmission device shown in FIG. 3 is a signal waveform diagram showing an example of a signal transmission system in FIG.

In FIG. 6, reference numeral 1 denotes a signal serial transmission interface 2 and a microcomputer having several tens of ports and the like built therein, which is a master station for signal transmission when installed in a control panel of a machine room. There is. 11 to 19 are microcomputers similar to the microcomputer 1,
It is a slave station for signal transmission provided on the hall control panel.
21 is also a microcomputer similar to the microcomputer 1, and is a slave station provided on the operation panel of the cab. 31 to 34 are indicators provided in the hall, 35 is an indicator provided in the cab, 41 to 44 are hall call registration lights that indicate the registration of hall calls (the distinction between upward and downward calls is omitted), 51 to 54 are halls A hall call button for registering a call (as for 41-44 up and down is omitted), 55 is a car operation panel provided in the car room 60, and includes a car destination floor registration button, registration lights, door opening and closing buttons, etc. However, details are omitted in the drawing. Reference numeral 101 denotes a signal bus connecting the microcomputer 1 and the microcomputers 11 to 19, and signal transmission (transmission / reception) between the control panel and the hall is performed using this line. 102 is a GND line of the signal bus 101, 103 is a signal line connecting the microcomputer 1 and the microcomputer 21, and signal transmission (transmission / reception) between the control panel and the car 60 is performed using this line. 104 is a GND line of the signal line 103. 1
Reference numerals 05 to 108 denote signal technique lines that are connected to the signal bus bar 101 using a connector (not shown) or the like and drawn into the hall operation panel on each floor. Although various power supply lines are provided from the control panel to the car operation panel and the hall operation panel, only lines related to signal transmission are shown here, and the others are not shown.

FIG. 7 is a detailed view of the portion A surrounded by a broken line in FIG. 6, and the transmitting / receiving portions of the other slave station microcomputers 11, 12, 19, 21 also have the same configuration. 71 to 72 are transmission transistors used at the time of transmission from the microcomputer 13, and 109 is a transmission terminal line.

FIG. 8 shows an example of signals transmitted / received in the apparatus shown in FIGS. 6 and 7, which is serial data in asynchronous transmission, in which 81 is a start bit and 82 to 89 are 8 bits. Data, 90 is a stop bit.

Next, the operation of the conventional elevator signal transmission device will be described.

First, a case will be described in which the master station microcomputer 1 transmits and the slave station microcomputer 13 receives.

An address is set in each of the microcomputers 1, 21, 11 to 19, for example, in a memory, and the microcomputer of the transmitting station first transmits the address of the microcomputer of the station to be received. It is now assumed that the address of the slave station microcomputer 13 is "13" in hexadecimal and the master station microcomputer 1 transmits data "01" to the slave station microcomputer 13.
In this case, the master station microcomputer 1 is the eighth
After sending the address "13" (82-84L level, 85H level, 86-87L level, 88-89H level) to the signal bus 101 in the format shown in the figure, the data "1" (82- 8
8L level, 89H level). On the other hand, the slave station microcomputers 11 to 19 all receive the signal "13", but the S / S start signal reception only when its own address matches the received address.
W is included, only the slave station 13 starts receiving data, and only the slave station microcomputer 13 receives data "1".

Next, a case where the slave station microcomputer 13 transmits and the master station microcomputer 1 receives will be described.

When the address of the master station microcomputer 1 is "01" and the slave station microcomputer 13 transmits the data "11" to the master station microcomputer 1, the slave station microcomputer 13 is sent in the same manner as in the above case. First, the address “01” is transmitted from the transmission terminal line 109 to the signal branch line 107 and the signal bus line 101, and then the data “11” is transmitted. The same applies when the master station microcomputer 1 transmits / receives to / from other slave station microcomputers 11, 12, and 19.

Transmission / reception between the slave station microcomputer 21 provided in the car and the master station microcomputer 1 of the control panel is performed through the signal serial transmission interface 2, and in the case of the master station microcomputer 1 and the microcomputers 11 to 19. Similarly to the above, transmission / reception is performed via the signal line 103.

[Problems to be Solved by the Invention] Problems in a conventional elevator signal transmission apparatus using a microcomputer will be described with reference to FIG.

For example, the transmission terminal of the slave station microcomputer 13 (7th
Transistor 7 connected to the part labeled TxD in the figure)
When 1 has an OFF failure, or when the transistor 72 has an ON failure, the signal bus 101 is always at the L level, so that all stations that perform signal transmission via this signal line 101 cannot perform signal transmission. turn into. The same happens when one of the transistors of any slave station causes the same failure. In addition, the slave station microcomputer 13 in FIG.
Assuming that the signal has run away and continues to send L to the transmission terminal line 109 at all times, the signal branch line 107 and the signal bus line 101 are always at the L level in this case as well, and the station transmitting the signal via this signal bus line 101 All signal transmission becomes impossible. And
In this state, even if any slave station causes such a runaway, signal transmission becomes impossible in the same manner.

Therefore, the present invention has been made to solve the above-mentioned problems, and even if one of the slave stations fails or runs out of control, the faulty station is disconnected from the transmission line and signal transmission of other stations is performed. An object of the present invention is to obtain an elevator signal transmission device capable of preventing the signal from straddling.

[Means for Solving the Problems] A signal transmission device for an elevator according to the present invention is characterized in that a contact provided in a signal transmission branch portion and a signal branch line on the slave station microcomputer side at this contact are connected to a power source. A slave station microcomputer runaway detection circuit for detecting a runaway of the slave station microcomputer and a switching element failure detection circuit for detecting a failure of a switching element are provided, and the two contacts are controlled by the slave station microcomputer runaway. This is performed by the detection circuit and the switching element failure detection circuit.

[Operation] In the elevator signal transmission apparatus according to the present invention, the switching element failure detection circuit or the microcomputer runaway detection circuit for the transmission transistor opens the contact provided on the signal branch line portion of the hall operation panel which is the slave station. As a result, the faulty slave station is separated from the signal bus, and the influence of the fault is not exerted on others.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing an elevator signal transmission apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart of software incorporated in a slave station microcomputer of the elevator signal transmission apparatus according to an embodiment of the present invention. 3 is a timing chart showing the operation of a switching element failure detection circuit of an elevator signal transmission apparatus according to an embodiment of the present invention, and FIG. 4 is a slave station microcomputer of an elevator signal transmission apparatus according to an embodiment of the present invention. FIG. 5 is a timing chart showing the operation of the runaway detection circuit, and FIG. 5 is a flow chart showing a failure detection program for the switching element of the signal transmission device for the elevator according to the embodiment of the present invention.

In FIG. 1, 201 is a signal branch line connected to a signal branch line 107 via a contact A (described later), 401 is a transistor 7
A switching element failure detection circuit for 1,72
2 is an AND circuit that takes the logical product of the signal branch line 201 and the transmission terminal line 109, 203 is an input terminal line connected to the input terminal A of the slave station microcomputer 13, and 204 is a retriggerable monostable multivibrator circuit. That is, what is triggered by the rising edge of the input signal (hereinafter abbreviated as mono-multi circuit), 205 is a latch circuit that stores the output of the mono-multi circuit 204, and 206A is connected to the output terminal A of the slave station microcomputer 13. Is an output terminal line that is connected to the reset terminal of the latch circuit 205. 206B is an output terminal line connected to the output terminal B of the slave station microcomputer 13, 402
Is a slave station microcomputer runaway detection circuit, 207 is a mono-multi circuit similar to 204, and 208 is a latch circuit.
A latch circuit similar to 205, which stores the output of the mono-multi circuit 207. 209 is a switching element failure detection circuit 4
An OR circuit that ORs the output of the slave station microcomputer runaway detection circuit 402 that detects the runaway of 01 and the slave station microcomputer 13, 210 is the coil of relay A, and 211 is the relay A
Break contact, 212 a relay make contact, 213 an input terminal line connected to the input terminal B of the slave station microcomputer 13, 214 an OR circuit, 215 a reset circuit that outputs a reset signal when the power is turned on, and 216 is It is a NOT circuit that reverses the logic. Incidentally, in FIG. 1, the ones marked with a circle on the input / output terminal portion of the circuit are negative logic, and the others are positive logic.

Next, the operation of the circuit of the elevator signal transmission apparatus according to this embodiment will be described.

First, when the power is turned on and the power-on reset is released, the output of the OR circuit 209 is L, and the coil 210 of the relay A is not excited. Therefore, contact points 211, 2
12 is the closed and open state, respectively. The slave station microcomputer 13 is operating according to the program shown in the flowchart of FIG. Here, if the transistor 72 has an ON failure (the same is true even if the transistor 71 has an OFF failure), as shown in the timing chart of FIG. 3, after the failure of the transistor (time t depends on the time constant setting of the monomulti). Determined), mono-multi circuit 204
Becomes L and the output of the latch circuit 205 becomes H, so that the output of the OR circuit 209 becomes H. Then, the relay A coil 210 is energized to open the break contact 211 and close the make contact 212.

Next, the transistor check is started as shown in the flowchart of FIG.

First, H is output to the signal line 109. Then, the signal level of the input terminal A is checked. At this time, if the signal level of the input terminal A is H, it is judged that the transistor of the own station is normal, the latch circuit 205 is reset, and the normal program is restored. In addition, the signal level of the input terminal A is L
If it is, it is judged that the transistor of the own station is abnormal, and the program is stopped in this state.

Next, the operation when the slave station microcomputer 13 runs out of control will be described.

As shown in the flow chart of FIG. 2, the slave station microcomputer 13 outputs H to the output terminal B at a constant cycle of the program.
Is programmed to output. Reference numerals 301 and 302 in the flow chart shown in FIG. As shown in the timing chart of FIG. 4, when the slave station microcomputer 13 runs out of control and the output terminal B does not go to H, the multi-multifunction is performed after t time (t is set by the time constant of the mono-multi circuit 207). The output of the circuit 207 becomes L and the output of the latch circuit 208 becomes H. Then, the output of the OR circuit 209 becomes H, the coil of the relay A is energized to open the contact 211, and at the same time, the output of the OR circuit 214 becomes L and the microcomputer 13 is reset.

In this embodiment, the slave station microcomputer 13 is described as having the signal serial transmission interface (UART) built therein, but it may be externally attached. Further, the contact 211 is described as a break contact and the contact 212 is described as a make contact. However, if the output logic of the OR circuit 209 is reversed, the same effect can be obtained even if the contact is reversed.

[Effects of the Invention] As described above, according to the signal transmission device for an elevator of the present invention, a contact is provided on a signal branch line connected to the slave station microcomputer, and a check is made from the contact point to the slave station microcomputer side. Since the contacts are provided and each contact is configured to be controlled by the program and the circuit that detects the runaway of the microcomputer, it is possible to disconnect the faulty slave station from the transmission system. This has an excellent effect that it is possible to easily limit the failure only to the own station without making the other slave stations unable to perform transmission / reception when the microcomputer is out of control and when the transmission switching element fails.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an elevator signal transmission apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart of software incorporated in a slave station microcomputer of the elevator signal transmission apparatus according to an embodiment of the present invention. 3 is a timing chart showing the operation of a switching element failure detection circuit of an elevator signal transmission apparatus according to an embodiment of the present invention, and FIG. 4 is a slave station microcomputer of an elevator signal transmission apparatus according to an embodiment of the present invention. 5 is a timing chart showing the operation of the runaway detection circuit, FIG. 5 is a flow chart showing a failure detection program for a switching element of an elevator signal transmission device according to an embodiment of the present invention, and FIG. 6 is a conventional elevator signal transmission device. Block diagram, FIG. 7 is a detailed block diagram of a portion indicated by A in FIG. Figure is a signal waveform diagram showing an example of a signal transmission method in the signal transmission device for an elevator shown in Figure 6. In the figure, 1 ... Master station microcomputer, 13 ... Slave station microcomputer, 101 ... Signal transmission bus bar, 105 to 107, 109 ...
… Signal transmission branch lines, 71,72 …… Switching elements, 211,212
...... Contact, 401 …… Switching element failure detection circuit, 402
...... Child station microcomputer runaway detection circuit. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A master station microcomputer for signal transmission provided on a control panel, a slave station microcomputer for signal transmission provided on each floor hall operation panel, and a signal transmission passed from the master station microcomputer to each floor. A signal transmission device for an elevator, comprising: a bus bar; a signal transmission branch line connected from the signal transmission bus bar to a slave station microcomputer; and a switching element provided in a transmission terminal section of the slave station microcomputer, wherein A contact provided on the line portion, another contact for connecting the signal branch line on the slave station microcomputer side to the power source at this contact, a slave station microcomputer runaway detection circuit for detecting runaway of the slave station microcomputer, and the switching A switching element failure detection circuit for detecting an element failure, and controlling the two contacts. A signal transmission device for an elevator, characterized in that it is carried out by a runaway detection circuit of a microcomputer and a switching element failure detection circuit.